/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*======
This file is part of TokuDB


Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.

    TokuDBis is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2,
    as published by the Free Software Foundation.

    TokuDB is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with TokuDB.  If not, see <http://www.gnu.org/licenses/>.

======= */

#ident \
    "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."

#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <tokudb_buffer.h>

static void test_null() {
  tokudb::buffer b;
  assert(b.data() == nullptr);
  assert(b.size() == 0);
  assert(b.limit() == 0);
  b.append(NULL, 0);
  assert(b.data() == nullptr);
  assert(b.size() == 0);
  assert(b.limit() == 0);
}

static void append_az(tokudb::buffer &b) {
  for (char c = 'a'; c <= 'z'; c++) {
    b.append(&c, sizeof c);
  }
}

static void assert_az(tokudb::buffer &b) {
  unsigned char *bp = NULL;
  for (size_t i = 0; i < b.size(); i++) {
    bp = (unsigned char *)b.data() + i;
    assert(*bp == 'a' + i);
  }
  assert(*bp == 'z');
}

static void assert_AZ(tokudb::buffer &b) {
  unsigned char *bp = NULL;
  for (size_t i = 0; i < b.size(); i++) {
    bp = (unsigned char *)b.data() + i;
    assert(*bp == 'A' + i);
  }
  assert(*bp == 'Z');
}

static void test_append() {
  tokudb::buffer a;

  a.append(NULL, 0);
  append_az(a);
  a.append(NULL, 0);
  assert(a.size() == 'z' - 'a' + 1);
  assert(a.size() <= a.limit());
  assert_az(a);

  tokudb::buffer b(a.data(), 0, a.size());
  for (size_t i = 0; i < b.limit(); i++) {
    assert(i <= a.size());
    char *ap = (char *)a.data() + i;
    assert(i <= b.limit());
    char *bp = (char *)b.data() + i;
    assert(*ap == *bp);
  }
}

static void test_consume() {
  tokudb::buffer a;
  append_az(a);
  tokudb::buffer b(a.data(), 0, a.size());
  for (size_t i = 0; i < b.limit(); i++) {
    unsigned char c;
    b.consume(&c, 1);
    assert(c == 'a' + i);
  }
  assert(b.size() == b.limit());
}

static void test_consume_ptr() {
  tokudb::buffer a;
  append_az(a);
  tokudb::buffer b(a.data(), 0, a.size());
  for (size_t i = 0; i < b.limit(); i++) {
    void *p = b.consume_ptr(1);
    unsigned char c = *(unsigned char *)p;
    assert(c == 'a' + i);
  }
  assert(b.size() == b.limit());
  assert(b.consume_ptr(1) == NULL);
}

static void test_replace() {
  tokudb::buffer a;
  append_az(a);
  assert_az(a);
  for (size_t i = 0; i < a.size(); i++) {
    unsigned char newc[1] = {(unsigned char)('A' + i)};
    a.replace(i, 1, newc, 1);
  }
  assert_AZ(a);
}

static void test_replace_grow() {
  tokudb::buffer a;
  append_az(a);
  assert_az(a);

  // grow field
  size_t orig_s = a.size();
  for (size_t i = 0; i < orig_s; i++) {
    unsigned char newc[2] = {(unsigned char)('a' + i),
                             (unsigned char)('a' + i)};
    size_t old_s = a.size();
    a.replace(2 * i, 1, newc, 2);
    assert(a.size() == old_s + 1);
  }
  for (size_t i = 0; i < a.size() / 2; i++) {
    unsigned char *cp = (unsigned char *)a.data() + 2 * i;
    assert(cp[0] == 'a' + i);
    assert(cp[1] == 'a' + i);
  }
}

static void test_replace_shrink() {
  tokudb::buffer a;
  for (char c = 'a'; c <= 'z'; c++) {
    a.append(&c, sizeof c);
    a.append(&c, sizeof c);
  }

  // shrink field
  for (size_t i = 0; i < a.size(); i++) {
    unsigned char newc[1] = {(unsigned char)('a' + i)};
    size_t s = a.size();
    a.replace(i, 2, newc, 1);
    assert(a.size() == s - 1);
  }
  assert_az(a);
}

static void test_replace_null() {
  tokudb::buffer a;
  append_az(a);
  assert_az(a);

  // insert between all
  size_t n = a.size();
  for (size_t i = 0; i < n; i++) {
    unsigned char newc[1] = {(unsigned char)('a' + i)};
    a.replace(2 * i, 0, newc, 1);
  }

  a.replace(a.size(), 0, (void *)"!", 1);
  a.append((void *)"?", 1);
}

namespace tokudb {
template size_t vlq_encode_ui(uint8_t, void *, size_t);
template size_t vlq_decode_ui(uint8_t *, void *, size_t);
template size_t vlq_encode_ui(uint32_t, void *, size_t);
template size_t vlq_decode_ui(uint32_t *, void *, size_t);
};  // namespace tokudb

static void test_ui8() {
  tokudb::buffer a;
  for (uint8_t n = 0;; n++) {
    assert(a.append_ui<uint8_t>(n) != 0);
    if (n == 255) break;
  }
  tokudb::buffer b(a.data(), 0, a.size());
  for (uint8_t n = 0;; n++) {
    uint8_t v;
    if (b.consume_ui<uint8_t>(&v) == 0) break;
    assert(v == n);
    if (n == 255) break;
  }
  assert(b.size() == b.limit());
}

static void test_ui32() {
  tokudb::buffer a;
  for (uint32_t n = 0;; n++) {
    assert(a.append_ui<uint32_t>(n) != 0);
    if (n == 1 << 22) break;
  }
  tokudb::buffer b(a.data(), 0, a.size());
  for (uint32_t n = 0;; n++) {
    uint32_t v;
    if (b.consume_ui<uint32_t>(&v) == 0) break;
    assert(v == n);
    if (n == 1 << 22) break;
  }
  assert(b.size() == b.limit());
}

int main() {
  test_null();
  test_append();
  test_consume();
  test_consume_ptr();
  test_replace();
  test_replace_grow();
  test_replace_shrink();
  test_replace_null();
  test_ui8();
  test_ui32();
  return 0;
}
